Mobile station apparatus, base station apparatus, management method in a mobile station apparatus, processing section and communication system

ABSTRACT

Provided are a communication system, a base station apparatus, a mobile station apparatus, and a communication method where a configuration message is transmitted or received. The configuration message includes a measurement configuration, where the measurement configuration includes a measurement object and a reporting configuration. The measurement object is used to determine a first cell from among the plurality of cells, the measurement object is linked to the reporting configuration and indicates the measurement frequency, the reporting configuration includes an criterion, and the criterion triggers the mobile station apparatus to send a measurement report.

This application is a Divisional of co-pending application Ser. No.13/142,255, filed on Sep. 20, 2011. application Ser. No. 13/142,255 isthe national phase of PCT International Application No.PCT/JP2009/069040 filed on Nov. 9, 2009 under 35 U.S.C. §371, whichclaims the benefit of priority of JP2008-332142, filed Dec. 26, 2008.The entire contents of each of the above-identified applications arehereby incorporated by reference.

TECHNICAL FIELD

The present invention relates to a mobile station apparatus, basestation apparatus, management method in a mobile station apparatus,processing section and communication system, and, more particularly, toa communication system comprising a plurality of component carriers anda mobile station apparatus, base station apparatus, management method ina mobile station apparatus, processing section and communication systemused in the communication system.

BACKGROUND ART

3GPP (3rd Generation Partnership Project) is a project for studying andcreating specifications of a cellular phone system based on a networkdeveloped from W-CDMA (Wideband-Code Division Multiple Access) and GSM(Global System for Mobile Communication).

In 3GPP, it has standardized the W-CDMA system as a third-generationcellular mobile communication system and the services are sequentiallystarted. HSDPA (High-Speed Downlink Packet Access) which communicationspeed is further improved has also been standardized and the servicesare started.

In 3GPP, it is currently studying a mobile communication system(hereinafter, LTE-A (Long Term Evolution-Advanced) or Advanced-EUTRA)that utilizes the Evolution of the third generation wireless accesstechnology (referred to as LTE (Long Term Evolution) or EUTRA (EvolvedUniversal Terrestrial Radio Access)) and a further wider systembandwidth to realize faster data transmission and reception.

The OFDMA method (Orthogonal Frequency Division Multiple Access) is amethod using mutually orthogonal subcarriers to performuser-multiplexing and is proposed as the downlink communication methodin EUTRA.

Technologies applied to the OFDMA method include an adaptive modulationand coding scheme (AMCS) based on adaptive radio link control (linkadaptation) of channel encoding and others.

AMCS is a scheme for switching wireless transmission parameters (alsoreferred to as AMC modes) such as an error-correcting method, anencoding ratio of error correction, and a data modulationmultiple-valued number depending on channel qualities of mobile stationapparatuses so as to efficiently perform a high-speed packet datatransmission.

The channel qualities of the mobile station apparatuses are fed back toa base station apparatus by using CQI (Channel Quality Indicator).

FIG. 20 is a diagram of a channel configuration used in a conventionalwireless communication system. The channel configuration is used in awireless communication system such as EUTRA (see Nonpatent Document 1).A wireless communication system depicted in FIG. 8 includes a basestation apparatus 100, mobile station apparatuses 200 a, 200 b, and 200c. R01 indicates a range where the base station apparatus 100 is able tocommunicate and the base station apparatus 100 communicates with mobilestation apparatuses located within this range R01.

In EUTRA, the downlink for transmitting signals from the base stationapparatus 100 to the mobile station apparatuses 200 a, 200 b, and 200 cuses a physical broadcast channel (PBCH), a physical downlink controlchannel (PDCCH), a physical downlink shared channel (PDSCH), a physicalmulticast channel (PMCH), a physical control format indicator channel(PCFICH), and a physical hybrid ARQ indicator channel (PHICH).

In EUTRA, the uplink for transmitting signals from the mobile stationapparatuses 200 a, 200 b, and 200 c to the base station apparatus 100uses a physical uplink shared channel (PUSCH), a physical uplink controlchannel (PUCCH), and a physical random access channel (PRACH).

LTE-A follows the basic system of SUTRA. While a typical system uses acontiguous frequency band, it is proposed for LTE-A to use a pluralityof contiguous or non-contiguous frequency bands (hereinafter, carriercomponents or component carriers) in a composite manner to implementoperation as one wider frequency band (wider system band) (frequencyband aggregation: spectrum aggregation, carrier aggregation). In otherwords, one system band comprises of a plurality of component carrierseach of which has a bandwidth corresponding to a part of the system bandthat is an available frequency band. Mobile station apparatuses of LTEand LTE-A can operate in each component carrier. It is also proposed togive different frequency bandwidths to a frequency band used for thedownlink communication and a frequency band used for the uplinkcommunication so as to flexibly use a frequency band allocated to amobile communication system.

PRIOR ART DOCUMENT Nonpatent Document

-   Nonpatent Document 1: 3GPP TS (Technical Specification) 36.300,    V8.4.0 (2008-03), Technical Specification Group Radio Access    Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and    Evolved Universal Terrestrial Radio Access Network (E-UTRAN);    Overall description; Stage 2 (Release 8)

SUMMARY OF THE INVENTION Problem to be Solved by the Invention

However, it is difficult to apply a measurement method used for thecommunication in one cell to a measurement method for the communicationthrough a plurality of component carriers in a conventionally knownwireless communication system. Since communication is performed througha plurality of component carriers, it is not known which componentcarrier should be used as a serving cell to perform the measurement. Itis also problematic that measurement parameters cannot be configuredwith consideration for parameters specific to the component carriers andthat measurement configuration has no flexibility when a componentcarrier is added or modified.

The present invention has been conceived in view of the situations andit is therefore an object of the present invention to provide a mobilestation apparatus, base station apparatus, management method in a mobilestation apparatus, processing section and communication system which areefficiently capable of managing the measurement configuration maintainedin a base station apparatus and a mobile station apparatus in a systemcomprising a plurality of component carriers and quickly capable ofexecuting communication.

A first technical means according to the present invention is a mobilestation apparatus in a communication system comprising a base stationapparatus and a mobile station apparatus, wherein at the time ofcommunication by carrier aggregation using a plurality of cells witheach cell having different frequency, the mobile station apparatusdetermines a measurement reference cell used for an evaluation of eventtriggering criteria from among the plurality of the cells based on ameasurement object linked to reporting configurations that indicateevent triggering criteria used for a measurement report.

A second technical means according to the present invention is a mobilestation apparatus of the first technical means, wherein the mobilestation apparatus evaluates the event triggering criteria usingmeasurement results for the measurement reference cell and reportsmeasurement results to the base station apparatus when the eventtriggering criteria are satisfied.

A third technical means according to the present invention is a mobilestation apparatus of the first technical means, wherein the mobilestation apparatus evaluates the event triggering criteria using aspecific offset value for a cell that is not determined as themeasurement reference cell and reports measurement results to the basestation apparatus when the event triggering criteria are satisfied.

A fourth technical means according to the present invention is a mobilestation apparatus of the third technical means, wherein the mobilestation apparatus evaluates the event triggering criteria using aspecific offset value for the measurement reference cells and reportsmeasurement results to the base station apparatus when the eventtriggering criteria are satisfied.

A fifth technical means according to the present invention is a mobilestation apparatus of the first technical means, wherein the mobilestation apparatus determines a measurement reference cell used for anevaluation of event triggering criteria from among the plurality of thecells based on the frequency to be measured.

A sixth technical means according to the present invention is a basestation apparatus in a communication system comprising a base stationapparatus and a mobile station apparatus, wherein at the time ofcommunication by carrier aggregation using a plurality of cells witheach cell having different frequency, the base station apparatus makesthe mobile station apparatus determine a measurement reference cell usedfor an evaluation of event triggering criteria, by the configurations ofreporting configurations that indicate event triggering criteria usedfor a measurement report, a measurement object linked to reportingconfigurations and the plurality of cells.

A seventh technical means according to the present invention is amanagement method in a mobile station apparatus in a communicationsystem comprising a base station apparatus and a mobile stationapparatus, wherein a measurement reference cell used for an evaluationof event triggering criteria is determined from among the plurality ofthe cells based on a measurement object linked to reportingconfigurations that indicate event triggering criteria used for ameasurement report at the time of communication by carrier aggregationusing the plurality of cells with each cell having different frequency.

An eighth technical means according to the present invention is aprocessing section that executes the management method of the seventhtechnical means, wherein the processing section executes the managementmethod by using a plurality of processing block sections and a higherblock section that integrates to control the plurality of the processingblock sections.

A ninth technical means according to the present invention is a mobilestation apparatus in a communication system comprising a base stationapparatus and a mobile station apparatus, wherein for a plurality ofcells with each cell having different frequency, the mobile stationapparatus considers a reference cell for a measurement object at thetime of performing measurements as a measurement reference cell, one ora plurality of the measurement reference cells for the measurementobject are indicated from the base station apparatus, and the mobilestation apparatus performs the measurements of the measurement objectfor the indicated one or a plurality of the measurement reference cells.

A tenth technical means according to the present invention is a mobilestation apparatus in a communication system comprising a base stationapparatus and a mobile station apparatus, wherein for a plurality ofcells with each cell having different frequency, one or a plurality ofthe measurement reference cells for a measurement object are indicatedfrom the base station apparatus, and the mobile station apparatusperforms measurement by applying an offset value corresponding to afrequency of a cell as a reference for a measurement object at the timeof performing measurements.

An eleventh technical means according to the present invention is acommunication system comprising a base station apparatus and a mobilestation apparatus, wherein for a plurality of cells with each cellhaving different frequency, the mobile station apparatus considers areference cell for a measurement object at the time of performingmeasurements as a measurement reference cell, one or a plurality of themeasurement reference cells for the measurement object are indicatedfrom the base station apparatus, and performs the measurements of themeasurement object for the indicated one or a plurality of themeasurement reference cells.

A twelfth technical means according to the present invention is acommunication system comprising a base station apparatus and a mobilestation apparatus, wherein for a plurality of cells with each cellhaving different frequency, the mobile station apparatus is indicatedone or a plurality of the measurement reference cells for a measurementobject from the base station apparatus, and performs the measurements byapplying an offset value corresponding to a frequency of a cell as areference for a measurement object at the time of performingmeasurements.

A thirteenth technical means according to the present invention is acommunication system comprising a base station apparatus and a mobilestation apparatus, wherein at the time of communication by carrieraggregation using a plurality of cells with each cell having differentfrequency, the mobile station apparatus determines a measurementreference cell used for an evaluation of event triggering criteria fromamong a plurality of the cells based on a measurement object linked toreporting configurations that indicate event triggering criteria usedfor a measurement report.

Effect of the Invention

The mobile station apparatus, base station apparatus, management methodin a mobile station apparatus, processing section and communicationsystem of the present invention are efficiently capable of managing themeasurement configuration configured by the base station apparatus andthe mobile station apparatus in the system comprising a plurality ofcomponent carriers and quickly capable of executing communication.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram of a configuration of downlink channels used in acommunication system according to a first embodiment of the presentinvention.

FIG. 2 is a diagram of a configuration of uplink channels used in thecommunication system according to the first embodiment of the presentinvention.

FIG. 3 is a diagram of an example of a network configuration accordingto the first embodiment of the present invention.

FIG. 4 is a general block diagram of a configuration of a base stationapparatus according to the first embodiment of the present invention.

FIG. 5 is a general block diagram of a configuration of a mobile stationapparatus according to the first embodiment of the present invention.

FIG. 6 is a diagram of an example of a serving cell according to thefirst embodiment of the present invention.

FIG. 7 is another diagram of an example of a serving cell according tothe first embodiment of the present invention.

FIG. 8 is a diagram of an example of inter-frequency measurement andintra-frequency measurement according to the first embodiment of thepresent invention.

FIG. 9 is a diagram of an example of a measurement reference cellaccording to the first embodiment of the present invention.

FIG. 10 is a diagram of another example of the measurement referencecell according to the first embodiment of the present invention.

FIG. 11 is a diagram of an example of first interpretation of eventtriggering criteria according to the first embodiment of the presentinvention.

FIG. 12 is a diagram of an example of second interpretation of eventtriggering criteria according to the first embodiment of the presentinvention.

FIG. 13 is a diagram of an example of third interpretation of eventtriggering criteria according to the first embodiment of the presentinvention.

FIG. 14 is a diagram of an example of fourth interpretation of eventtriggering criteria according to the first embodiment of the presentinvention.

FIG. 15 is a diagram of an example of a processing method of systeminformation related to the measurement according to the first embodimentof the present invention.

FIG. 16 is a diagram of an example of a serving cell according to asecond embodiment of the present invention.

FIG. 17 is another diagram of an example of a serving cell according tothe second embodiment of the present invention.

FIG. 18 is a diagram of an example of inter-frequency measurement andintra-frequency measurement according to the second embodiment of thepresent invention.

FIG. 19 is a diagram of an example of interpretation of event triggeringcriteria according to the second embodiment of the present invention.

FIG. 20 is a diagram of a channel configuration used in a conventionalwireless communication system.

MODES FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will now be described withreference to the drawings.

A first embodiment of the present invention will be described. Awireless communication system according to the first embodiment of thepresent invention includes, and performs wireless communication between,one or more base station apparatuses and one or more mobile stationapparatuses. One base station apparatus configures one or more cells andone cell can contain one or more mobile station apparatuses.

<Regarding Measurement (Single Cell Communication)>

Measurement will then be described. The base station apparatus transmitsa measurement configuration message to the mobile station apparatus byusing an RRC connection reconfiguration (RRCConnectionReconfiguration)message of RRC signaling (radio resource control signal). The mobilestation apparatus configures system information including in themeasurement configuration message and performs the measurement, theevent evaluation, and the measurement report for a serving cell and aneighboring cell (including a listed cell and/or detected cell) inaccordance with the provided system information. The listed cell is acell listed in a measurement object (cells in a neighboring cell listfrom the base station apparatus to the mobile station apparatus) and thedetected cell is a cell detected by the mobile station apparatus onfrequency indicated by a measurement object and not listed in themeasurement object (cells detected by the mobile station apparatusitself and not in the neighboring cell list).

There are three types of measurement (intra-frequency measurements,inter-frequency measurements and inter-radio access technologymeasurements (inter-RAT measurements)). The intra-frequency measurementsmean measurements at a downlink frequency of a serving cell (downlinkfrequency). The inter-frequency measurements mean measurements at afrequency different from the downlink frequency of the serving cell. Theinter-radio access technology measurements (inter-RAT measurements) meanmeasurements with a wireless technology (e.g., UTRA, GERAN, or CDMA2000)different from the wireless technology of the serving cell (e.g.,EUTRA).

The measurement configuration message includes addition and/ormodification and/or deletion of configuration of a measurementidentifier (measId), a measurement object and a reporting configurationas well as a quantity configuration (quantityConfig), a measurement gapconfiguration (measGapConfig), a serving cell quality threshold(s-Measure) and others.

<Quantity Configuration (quantityConfig)>

The quantity configuration (quantityConfig) specifies a third-layerfiltering coefficient (L3 filtering coefficient) if the measurementobject is EUTRA. The third-layer filtering coefficient (L3 filteringcoefficient) prescribes a ratio (rate) between the latest measurementresult and a previous filtering measurement result. The filtering resultis utilized for the event evaluation in the mobile station apparatus.

<Measurement Gap Configuration (measGapConfig)>

The measurement gap configuration (measGapConfig) is utilized forcontrolling the configuration of a measurement gap pattern and theactivation/deactivation of a measurement gap. The measurement gapconfiguration (measGapConfig) includes providing a gap pattern, a startsystem frame number (startSFN), and a start sub-frame number(startSubframeNumber) as information in the case of activating themeasurement gap. The gap pattern prescribes which pattern is used as themeasurement gap. The start system frame number (startSFN) prescribes SFN(System Frame Number) for starting the measurement gap. The startsub-frame number (startSubframeNumber) prescribes a sub-frame number forstarting the measurement gap.

<Serving Cell Quality Threshold (s-Measure)>

The serving cell quality threshold (s-Measure) represents a thresholdfor quality of a serving cell and is utilized for controlling whetherthe mobile station apparatus needs to perform the measurement. Theserving cell quality threshold (s-Measure) is configured as a value fora reference signal received power (RSRP).

<Measurement Identifier (measId)>

The measurement identifier (measId) is utilized for linking themeasurement objects with the reporting configurations and specificallylinks a measurement object identifier (measObjectId) with a reportingconfiguration identifier (reportConfigId). The measurement identifier(measId) is corresponding to one measurement object identifier(measObjectId) and one reporting configuration identifier(reportConfigId). The measurement configuration message can beadded/modified/deleted in terms of relationships with the measurementidentifier (measId), the measurement object, and the reportingconfiguration.

MeasObjectToRemoveList is a command for deleting a specified measurementobject identifier (measObjectId) and a measurement object correspondingto the specified measurement object identifier (measObjectId). In thiscase, all the measurement identifiers (measId) correlated with thespecified measurement object identifier (measObjectId) are deleted. Thiscommand can specify a plurality of measurement object identifiers(measObjectId) at the same time.

MeasObjectToAddModifyList is a command for modifying a specifiedmeasurement object identifier (measObjectId) for a specified measurementobject or for adding a specified measurement object identifier(measObjectId) and a specified measurement object. This command canspecify a plurality of measurement object identifiers (measObjectId) atthe same time.

ReportConfigToRemoveList is a command for deleting a specified reportingconfiguration identifier (reportConfigId) and a specified reportingconfiguration corresponding to the specified reporting configurationidentifier (reportConfigId). In this case, all the measurementidentifiers (measId) correlated with the specified reportingconfiguration identifier (reportConfigId) are deleted. This command canspecify a plurality of reporting configuration identifiers(reportConfigId) at the same time.

ReportConfigToAddModifyList is a command for modifying a specifiedreporting configuration identifier (reportConfigId) for a specifiedreporting configuration or for adding a specified reportingconfiguration identifier (reportConfigId) and a specified reportingconfiguration. This command can specify a plurality of reportingconfiguration identifiers (reportConfigId) at the same time.

MeasIdToRemoveList is a command for deleting a specified measurementidentifier (measId). In this case, the measurement object identifier(measObjectId) and the reporting configuration identifier(reportConfigId) correlated with the specified measurement identifier(measId) are not deleted and are maintained. This command can specify aplurality of measurement identifiers (measId) at the same time.

MeasIdToAddModifyList is a command for correlating a specifiedmeasurement identifier (measId) with a specified measurement objectidentifier (measObjectId) and a specified reporting configurationidentifier (reportConfigId) or for correlating a specified measurementobject identifier (measObjectId) and a specified reporting configurationidentifier (reportConfigId) with a specified measurement identifier(measId) to add the specified measurement identifier (measId). Thiscommand can specify a plurality of measurement identifiers (measId) atthe same time.

<Measurement Object>

The measurement object is prescribed for each radio access technology(RAT) and each frequency. The reporting configurations includeprescriptions for EUTRA and prescriptions for RAT other than EUTRA.

The measurement objects include a measurement object EUTRA(measObjectEUTRA) correlated with a measurement object identifier(measObjectId).

The measurement object identifier (measObjectId) is an identifier usedfor identifying the configuration of the measurement object. Theconfiguration of the measurement objects is prescribed for each radioaccess technology (RAT) and frequency as described above. Themeasurement objects are separately specified for EUTRAN, UTRA, GERAN,and CDMA2000. The measurement object EUTRA (measObjectEUTRA) is ameasurement object for EUTRA and prescribes information applied toneighboring cells of EUTRA. A measurement object EUTRA (measObjectEUTRA)having a different frequency is handled as a different measurementobject and is separately assigned with a measurement object identifier(measObjectId).

The measurement object EUTRA (measObjectEUTRA) includes EUTRA carrierfrequency information (eutra-CarrierInfo), a measurement bandwidth(measurementBandwidth), an offset frequency (offsetFreq), informationrelated to a neighboring cell list, and information related to a blacklist.

The information included in the measurement object EUTRA(measObjectEUTRA) will then be described. The EUTRA carrier frequencyinformation (eutra-CarrierInfo) specifies a carrier frequency that is tobe a measurement object. The measurement bandwidth(measurementBandwidth) indicates a measurement bandwidth common to allthe neighboring cells operating in the carrier frequency defined as themeasurement object. The offset frequency (offsetFreq) indicates ameasurement offset value applied to the frequency defined as themeasurement object.

The information related to a neighboring cell list includes informationrelated to neighboring cells that are to be objects of the eventevaluation and the measurement report. The information related to aneighboring cell list includes a physical cell identifier (physical cellID), a cell individual offset (cellIndividualOffset; indicative of ameasurement offset value applied to a neighboring cell) and others. Inthe case of EUTRA, this information is utilized as information forperforming addition/modification or deletion in the neighboring celllist already acquired by the mobile station apparatus from the broadcastinformation (broadcasted system information).

The information related to a black list includes information related toneighboring cells that are not to be objects of the event evaluation andthe measurement report. The information related to a black list includesa physical cell identifier (physical cell ID) and others. In the case ofEUTRA, this information is utilized as information for performingaddition/modification or deletion in a black cell list (black listedcell list) already acquired by the mobile station apparatus from thebroadcast information.

<Reporting Configuration>

The reporting configuration includes reporting configuration EUTRA(reportConfigEUTRA) corresponding to a reporting configurationidentifier (reportConfigId) and others.

The reporting configuration identifier (reportConfigId) is an identifierused for identifying the reporting configuration related to themeasurements. The reporting configuration related to the measurementsincludes prescriptions for EUTRA and prescriptions for RAT other thanEUTRA (UTRA, GERAN, CDMA2000) as described above. The reportingconfiguration EUTRA (reportConfigEUTRA) is the reporting configurationfor EUTRA and defines triggering criteria of an event utilized forreporting the measurements in EUTRA.

The reporting configuration EUTRA (reportConfigEUTRA) includes an eventidentifier (eventId), a triggering quantity (triggerQuantity),hysteresis, a time to trigger (timeToTrigger), a report quantity(reportQuantity), a maximum reporting cell number (maxReportCells), areporting interval (reportInterval), and a reporting amount(reportAmmount).

The reporting configuration EUTRA (reportConfigEUTRA) will then bedescribed. The event identifier (eventId) is utilized for selectingcriteria related to event triggered reporting. The event triggeredreporting is a method of reporting the measurements when the eventtriggering criteria are satisfied. Event triggered periodic reportingalso exists for reporting the measurements a certain number of times atregular intervals when the event triggering criteria are satisfied.

The event triggering criteria include five types as described later. Ifthe event triggering criteria specified by the event identifier(eventId) are satisfied, the mobile station apparatus performs themeasurement report to the base station apparatus. The triggeringquantity (triggerQuantity) is a quantity utilized for evaluating theevent triggering criteria. A reference signal received power (RSRP) or areference signal received quality (RSRQ) is specified. The mobilestation apparatus utilizes a quantity specified by the triggeringquantity (triggerQuantity) to perform the measurements of a downlinkreference signal and determines whether the event triggering criteriaspecified by the event identifier (eventId) are satisfied. Thehysteresis is a parameter utilized in the event triggering criteria. Thetime to trigger (timeToTrigger) indicates a period while the eventtriggering criteria should be satisfied. The report quantity(reportQuantity) indicates a quantity reported in the measurementreport. In this case, a quantity specified by the triggering quantity(triggerQuantity), or the reference signal received power (RSRP) and thereference signal received quality (RSRQ) are specified. The referencesignal received quality (RSRQ) is a ratio represented by (N*RSRP)/(EUTRAcarrier RSSI). The reception signal intensity (EUTRA carrier RSSI)indicates the intensity of total reception signal power and themeasurement bandwidth is the same as the system bandwidth. N denotes thenumber of resource blocks (RB) related to the measurement bandwidth ofthe reception signal intensity (EUTRA carrier RSSI). The maximumreporting cell number (maxReportCells) indicates the maximum number ofcells included in the measurement report. The reporting interval(reportInterval) is utilized for the periodical reporting or the eventtriggered periodic reporting and the reporting is periodically performedat intervals indicated by the reporting interval (reportInterval). Thereporting amount (reportAmmount) prescribes the number of times of theperiodical reporting as needed.

Threshold parameters and offset parameters (a1_Threshold, a2_Threshold,a3_Offset, a4_Threshold, a5_Threshold1, a5_Threshold2) utilized in theevent triggering criteria are provided to the mobile station apparatustogether with the event identifier (eventId) in the reportingconfiguration EUTRA (reportConfigEUTRA).

<Regarding Event Triggering Criteria>

The event triggering criteria for performing the measurement report aredefined in the following five types, each having an entering conditionand a leaving condition. Therefore, if a mobile station apparatussatisfies an entering condition for an event specified by the basestation apparatus, the mobile station apparatus transmits a measurementreport to the base station apparatus. On the other hand, if a mobilestation apparatus satisfying an event of entering condition andtransmitting a measurement report satisfies an event of leavingcondition, the mobile station apparatus stops the transmission of themeasurement report. The entering condition and the leaving condition forevents are as follows:

<Event A1>

Event A1 entering condition: Ms-Hys>a1_ThresholdEvent A1 leaving condition: Ms+Hys<a1_Threshold

<Event A2>

Event A2 entering condition: Ms-Hys>a2_ThresholdEvent A2 leaving condition: Ms+Hys<a2_Threshold

<Event A3>

Event A3 entering condition: Mn+Ofn+Ocn−Hys>Ms+Ofs+Ocs+a3_OffsetEvent A3 leaving condition: Mn+Ofn+Ocn+Hys<Ms+Ofs+Ocs+a3_Offset

<Event A4>

Event A4 entering condition: Mn+Ofn+Ocn−Hys>a4_ThresholdEvent A4 leaving condition: Mn+Ofn+Ocn−Hys<a4_Threshold

<Event A5>

Event A5 entering condition: Ms-Hys<a5_Threshold1,Mn+Ofn+Ocn−Hys>a5_Threshold2Event A5 leaving condition: Ms+Hys>a5_Threshold1,Mn+Ofn+Ocn+Hys<a5_Threshold2

Ms denotes a measurement result for a serving cell (without consideringa measurement offset value specific to the cell). Mn denotes ameasurement result for a neighboring cell. Hys is a hysteresis parameterfor an event of interest.

Ofn denotes a frequency-specific measurement offset value for afrequency of a neighboring cell. Ofn corresponds to an offset frequency(offsetFreq) of the measurement object EUTRA (measObjectEUTRA). In thecase of the intra-frequency measurements, Ofn is the same as Ofs. In thecase of the inter-frequency measurements, Ofn is an offset frequency(offsetFreq) included in the measurement object EUTRA (measObjectEUTRA)corresponding to a downlink frequency different from the serving cell.

Ocn is a cell-specific measurement offset value for a neighboring cell.Ocn corresponds to a cell individual offset (cellIndividualOffset) ofthe measurement object EUTRA (measObjectEUTRA). If Ocn is notconfigured, the measurement offset value is configured to zero. In thecase of the intra-frequency measurements, Ocn is a cell individualoffset (cellIndividualOffset) included in the measurement object EUTRA(measObjectEUTRA) of the downlink frequency the same as the servingcell. In the case of the inter-frequency measurements, Ocn is a cellindividual offset (cellIndividualOffset) included in the measurementobject EUTRA (measObjectEUTRA) corresponding to a downlink frequencydifferent from the serving cell.

Ofs is a frequency-specific offset value for a frequency of a servingcell. Ofs corresponds to an offset frequency (offsetFreq) of themeasurement object EUTRA (measObjectEUTRA).

Ocs is a cell-specific measurement offset value for the serving cell.Ocs is included in a cell individual offset (cellIndividualOffset) ofthe measurement object EUTRA (measObjectEUTRA) of the frequency of theserving cell.

The a1_Threshold is a threshold parameter utilized for the event A1. Thea2_Threshold is a threshold parameter utilized for the event A2. Thea3_Offset is an offset parameter utilized for the event A3. Thea4_Threshold is a threshold parameter utilized for the event A4. Thea5_Threshold1 and a5_Threshold2 are threshold parameters utilized forthe event A5.

The mobile station generates the events in accordance with themeasurement result Ms of the serving cell and the measurement result Mnof the neighboring cell. If the measurement result Ms of the servingcell is better than the threshold a1_Threshold after the application ofthe parameters, the event A1 is generated and, if worse than thethreshold a2_Threshold, the event A2 is generated. If the measurementresult Mn of the neighboring cell is better than the serving cellmeasurement result Ms and the offset a3_Offset after the application ofthe parameters, the event A3 is generated and, if the measurement resultMn of the neighboring cell is better than the threshold a4_Thresholdafter the application of the parameters, the event A4 is generated. Ifthe measurement result Ms of the serving cell is worse than thethreshold a5_Threshold1 after the application of the parameters and themeasurement result Mn of the neighboring cell is better than thethreshold a5_Threshold2 after the application of the parameters, theevent A5 is generated.

The base station apparatus provides the serving cell quality threshold(s-Measure) in some cases and not in other cases. If the base stationapparatus provides the serving cell quality threshold (s-Measure), themobile station apparatus performs the measurements of a neighboring celland the event evaluation (whether the event triggering criteria aresatisfied; also known as the evaluation of reporting criteria) when thequality (RSRP value) of the serving cell is lower than the serving cellquality threshold (s-Measure). On the other hand, if the base stationapparatus does not provide the serving cell quality threshold(s-Measure), the mobile station apparatus performs the measurements of aneighboring cell and the event evaluation regardless of the quality(RSRP value) of the serving cell.

<Regarding Measurement Result>

The mobile station apparatus satisfying the event triggering criteriatransmits a measurement report to the base station apparatus. Themeasurement report includes a measurement result.

This measurement result comprises of a measurement identifier (measId),a serving cell measurement result (measResultServing) and a EUTRAmeasurement result list (measResultListEUTRA). The EUTRA measurementresult list (measResultListEUTRA) includes a physical cell identifier(physicalCellIdentity) and a EUTRA cell measurement result(measResultEUTRA).

The measurement identifier (measId) is an identifier utilized forlinking the measurement object identifier (measObjectId) and thereporting configuration identifier (reportConfigId) as described above.The serving cell measurement result (measResultServing) is a measurementresult for a serving cell and reports the results of both the referencesignal received power (RSRP) and the reference signal received quality(RSRQ) for the serving cell. A measurement result for a serving cell isalways included in the measurement result. The physical cell identifier(physicalCellIdentity) is utilized for identifying a cell. The EUTRAcell measurement result (measResultEUTRA) is a measurement result for aEUTRA cell. A measurement result of a neighboring cell is included onlywhen a relevant event is generated.

FIG. 1 is a diagram of a configuration of downlink channels used in acommunication system according to a first embodiment of the presentinvention. FIG. 2 is a diagram of a configuration of uplink channelsused in the communication system according to the first embodiment ofthe present invention. Both the downlink channels depicted in FIG. 1 andthe uplink channels depicted in FIG. 2 comprise of logical channels,transport channels and physical channels.

The logical channels define types of data transmission servicestransmitted/received through a medium access control (MAC) layer. Thetransport channels define what characteristics the data transmitted bywireless interfaces have and how the data are transmitted. The physicalchannels are physical channels that carry the transport channels.

The downlink logical channels include a broadcast control channel(BCCH), a paging control channel (PCCH), a common control channel(CCCH), a dedicated control channel (DCCH), a dedicated traffic channel(DTCH), a multicast control channel (MCCH), and a multicast trafficchannel (MTCH). The uplink logical channels include the common controlchannel (CCCH), the dedicated control channel (DCCH), and the dedicatedtraffic channel (DTCH).

The downlink transport channels include a broadcast channel (BCH), apaging channel (PCH), a downlink shared channel (DL-SCH), and amulticast channel (MCH). The uplink transport channels include an uplinkshared channel (UL-SCH) and a random access channel (RACH).

The downlink physical channels include a physical broadcast channel(PBCH), a physical downlink control channel (PDCCH), a physical downlinkshared channel (PDSCH), a physical multicast channel (PMCH), a physicalcontrol format indicator channel (PCFICH), and a physical hybrid ARQindicator channel (PHICH). The uplink physical channels include aphysical uplink shared channel (PUSCH), a physical random access channel(PRACH), and a physical uplink control channel (PUCCH).

These channels are transmitted/received between the base stationapparatus and the mobile station apparatuses as depicted in FIG. 20described in terms of a conventional technology.

The logical channels will then be described. The broadcast controlchannel (BCCH) is a downlink channel used for broadcasting the systeminformation. The paging control channel (PCCH) is a downlink channelused for transmitting paging information and is used when a network doesnot know a cell position of a mobile station apparatus.

The common control channel (CCCH) is a channel used for transmittingcontrol information between a mobile station apparatus and a network andis used by a mobile station apparatus not having radio resource control(RRC) connection with the network.

The dedicated control channel (DCCH) is a point-to-point bidirectionalchannel and is a channel utilized for transmitting individual controlinformation between a mobile station apparatus and the network. Thededicated control channel (DCCH) is used by a mobile station apparatushaving the RRC connection.

The dedicated traffic channel (DTCH) is a point-to-point bidirectionalchannel dedicated to one mobile station apparatus and is utilized fortransferring user information (unicast data).

The multicast control channel (MCCH) is a downlink channel used forperforming point-to-multipoint transmission of MBMS (multimediabroadcast multicast service) control information from a network to amobile station apparatus. This is used in the MBMS service providing aservice in a point-to-multipoint manner.

MBMS service transmitting methods include single-cellpoint-to-multipoint (SCPTM) transmission and multimedia broadcastmulticast service single frequency network (MBSFN) transmission. TheMBSFN transmission is a concurrent transmission technique realized byconcurrently transmitting an identifiable waveform (signal) from aplurality of cells. On the other hand, the SCPTM transmission is amethod of transmitting the MBMS service by one base station apparatus.

The multicast control channel (MCCH) is utilized for one or moremulticast traffic channels (MTCH). The multicast traffic channel (MTCH)is a downlink channel used for performing point-to-multipointtransmission of traffic data from a network to a mobile stationapparatus.

The multicast control channel (MCCH) and the multicast traffic channel(MTCH) are utilized only by a mobile station apparatus that receivesMBMS.

The transport channels will be described. The broadcast channel (BCH) isbroadcasted to the entire cell in accordance with a fixed andpreliminarily defined transmission format. In the downlink sharedchannel (DL-SCH), HARQ (hybrid automatic repeat request), the dynamicadaptive radio link control, the non-contiguous reception (DRX), and theMBMS transmission are supported and need to be broadcasted to the entirecell.

In the downlink shared channel (DL-SCH), the beamforming can be utilizedand dynamic resource allocation and semi-static resource allocation aresupported. The paging channel (PCH) supports DRX and need to bebroadcasted to the entire cell.

The paging channel (PCH) is mapped to a physical resource that isdynamically used for traffic channels or other control channels, i.e.,the physical downlink shared channel (PDSCH).

The multicast channel (MCH) need to be broadcasted to the entire cell.The multicast channel (MCH) supports semi-static resource allocationsuch as MBSFN (MBMS single frequency network) combining of the MBMStransmission from a plurality of cells and a time frame using theextended cyclic prefix (CP).

The uplink shared channel (UL-SCH) supports HARQ and the dynamicadaptive radio link control. The uplink shared channel (UL-SCH) canutilize the beamforming. The dynamic resource allocation and thesemi-static resource allocation are supported. The random access channel(RACH) transmits limited control information and has a risk ofcollision.

The physical channels will be described. The physical broadcast channel(PBCH) maps the broadcast channel (BCH) at intervals of 40 milliseconds.Blind detection is performed for the timing of 40 milliseconds.Therefore, explicit signaling may not be performed for the presentationof the timing. A sub-frame including the physical broadcast channel(PBCH) can be decoded by itself (self-decodable).

The physical downlink control channel (PDCCH) is a channel used fornotifying the mobile station apparatus of the resource allocation of thedownlink shared channel (PDSCH), the hybrid automatic repeat request(HARQ) information for the downlink data, and the uplink transmissionpermission (uplink grant) that is the resource allocation of thephysical uplink shared channel (PUSCH).

The physical downlink shared channel (PDSCH) is a channel used fortransmitting the downlink data or the paging information. The physicalmulticast channel (PMCH) is a channel utilized for transmitting themulticast channel (MCH), and a downlink reference signal, an uplinkreference signal, and a physical downlink synchronization signal areseparately located.

The physical uplink shared channel (PUSCH) is a channel mainly used fortransmitting the uplink data (UL-SCH). When the base station apparatus100 schedules the mobile station apparatus 200, the physical uplinkshared channel (PUSCH) is also used for transmitting a channel feedbackreport (a downlink channel quality indicator CQI, a precoding matrixindicator PMI, and a rank indicator RI) and HARQ acknowledgement(ACK)/negative acknowledgement (NACK) for downlink transmission.

The physical random access channel (PRACH) is a channel used fortransmitting a random access preamble and has a guard time. The physicaluplink control channel (PUCCH) is a channel used for transmitting thechannel feedback report (CQI, PMI, and RI), a scheduling request (SR),and HARQ acknowledgement/negative acknowledgement for downlinktransmission.

The physical control format indicator channel (PCFICH) is a channelutilized for notifying the mobile station apparatus of an OFDM symbolnumber used for the physical downlink control channel (PDCCH) andtransmitted in sub-frames.

The physical hybrid ARQ indicator channel (PHICH) is a channel utilizedfor transmitting HARQ ACK/NACK for uplink transmission.

The downlink reference signal (DL-RS) is a pilot signal transmitted witha predetermined power for each cell. The downlink reference signal is asignal periodically repeated at predetermined time intervals (e.g., oneframe) and the mobile station apparatus receives the downlink referencesignal at predetermined time intervals and measures the receptionquality for the determination of the reception quality for each cell.The downlink reference signal is also used as a reference signal fordemodulating the downlink data transmitted concurrently with thedownlink reference signal. A sequence used for the downlink referencesignal may be any sequence as long as a sequence is uniquelyidentifiable for each cell.

The channel mapping by the communication system according to the firstembodiment of the present invention will be described.

As depicted in FIG. 1, the transport channels and the physical channelsare mapped in the downlink as follows. The broadcast channel (BCH) ismapped to the physical broadcast channel (PBCH).

The multicast channel (MCH) is mapped to the physical multicast channel(PMCH). The paging channel (PCH) and the downlink shared channel(DL-SCH) are mapped to the physical downlink shared channel (PDSCH).

The physical downlink control channel (PDCCH), the physical hybrid ARQindicator channel (PHICH), and the physical control format indicatorchannel (PCFICH) are independently used in the physical channels.

On the other hand, the transport channels and the physical channels aremapped in the uplink as follows. The uplink shared channel (UL-SCH) ismapped to the physical uplink shared channel (PUCCH).

The random access channel (RACH) is mapped to the physical random accesschannel (PRACH). The physical uplink control channel (PUCCH) isindependently used in the physical channels.

The logical channels and the transport channels are mapped in thedownlink as follows. The paging control channel (PCCH) is mapped to thepaging channel (PCH).

The broadcast control channel (BCCH) is mapped to the broadcast channel(BCH) and the downlink shared channel (DL-SCH). The common controlchannel (CCCH), the dedicated control channel (DCCH), and the dedicatedtraffic channel (DTCH) are mapped to the downlink shared channel(DL-SCH).

The multicast control channel (MCCH) is mapped to the downlink sharedchannel (DL-SCH) and the multicast channel (MCH). The multicast trafficchannel (MTCH) is mapped to the downlink shared channel (DL-SCH) and themulticast channel (MCH).

The mapping from the multicast control channel (MCCH) and the multicasttraffic channel (MTCH) to the multicast channel (MCH) is performed atthe time of the MBSFN transmission while these channels are mapped tothe downlink shared channel (DL-SCH) at the time of the SCPTMtransmission.

On the other hand, the logical channels and the transport channels aremapped in the uplink as follows. The common control channel (CCCH), thededicated control channel (DCCH), and the dedicated traffic channel(DTCH) are mapped to the uplink shared channel (UL-SCH). The randomaccess channel (RACH) is not mapped to a logical channel.

FIG. 4 is a general block diagram of a configuration of the base stationapparatus 100 according to the first embodiment of the presentinvention. The base station apparatus 100 includes a data controlsection 101, an OFDM modulating section 102, a wireless section 103, ascheduling section 104, a channel estimating section 105, a DFT-S-OFDM(DFT-Spread-OFDM) demodulating section 106, a data extracting section107, a higher layer 108, and an antenna section A1.

A receiving section comprises of the wireless section 103, thescheduling section 104, the channel estimating section 105, theDFT-S-OFDM demodulating section 106, the data extracting section 107,the higher layer 108, and the antenna section A1. A transmitting sectioncomprises of the data control section 101, the OFDM modulating section102, the wireless section 103, the scheduling section 104, the higherlayer 108, and the antenna section A1. Some part of the respectivereceiving section and transmitting section is configured to separatelyexecute processing for each component carrier and some other part isconfigured to execute processing common to component carriers.

The antenna section A1, the wireless section 103, the channel estimatingsection 105, the DFT-S-OFDM demodulating section 106, and the dataextracting section 107 execute processing for an uplink physical layer.The antenna section A2, the data control section 101, the OFDMmodulating section 102, and the wireless section 103 execute processingfor a downlink physical layer.

The data control section 101 acquires the transport channels from thescheduling section 104. The data control section 101 maps the transportchannels as well as signals and channels generated in the physical layerbased on the scheduling information input from the scheduling section104, to the physical channels based on the scheduling information inputfrom the scheduling section 104. The data mapped as described above areoutput to the OFDM modulating section 102.

The OFDM modulating section 102 executes the encoding, the datamodulation, the input signal serial/parallel conversion, the IFFT(Inverse Fast Fourier Transform) processing, and the insertion of cyclicprefix (CP) as well as the OFDM signal processing such as filtering forthe data input from the data control section 101 to generate and outputan OFDM signal to the wireless section 103 based on the schedulinginformation input from the scheduling section 104 (including downlinkphysical resource block (PRB) allocation information (e.g., physicalresource block position information such as frequency and time), and amodulation method and an encoding method corresponding to each downlinkphysical resource block (PRB) (e.g., 16QAM modulation, 2/3 codingrate)).

The wireless section 103 up-converts the modulated data input from theOFDM modulating section 102 to a radio frequency to generate andtransmit a radio signal to the mobile station apparatus 200 via theantenna section A1. The wireless section 103 receives an uplink radiosignal from the mobile station apparatus 200 via the antenna section A1and down-converts the signal to a baseband signal to output thereception data to the channel estimating section 105 and the DFT-S-OFDMdemodulating section 106.

The scheduling section 104 executes processing for a medium accesscontrol (MAC) layer. The scheduling section 104 performs the mapping ofthe logical channels and the transport channels, the scheduling of thedownlink and the uplink (such as HARQ processing and selection of atransport format) and others. Since the scheduling section 104integrates to control the processing sections of the physical layers,interfaces exist between the scheduling section 104 and the antennasection A1, the wireless section 103, the channel estimating section105, the DFT-S-OFDM demodulating section 106, the data control section101, the OFDM modulating section 102, and the data extracting section107. However, the interfaces are not depicted.

In the scheduling of the downlink, the scheduling section 104 executesthe selection processing of a downlink transport format (transmissionform) for modulating data (allocation of physical resource blocks (PRB)and a modulating method and an encoding method) and the generation ofthe scheduling information used in the retransmission control in HARQand the downlink scheduling, based on feedback information received fromthe mobile station apparatus 200 (a downlink channel feedback report(channel quality (CQI), the number of streams (RI), precodinginformation (PMI) and others.) and ACK/NACK feedback information fordownlink data), the information of available downlink physical resourceblocks (PRB) of the mobile station apparatuses, a buffer status, thescheduling information input from the higher layer 108 and others. Thescheduling information used for the downlink scheduling is output to thedata control section 101 and the data extracting section 107.

In the scheduling of the uplink, the scheduling section 104 executes theselection processing of an uplink transport format (transmission form)for modulating data (allocation of physical resource blocks (PRB) and amodulating method and an encoding method) and the generation of thescheduling information used in the uplink scheduling, based on anestimation result of an uplink channel state (wireless propagationchannel state) output by the channel estimating section 105, a resourceallocation request from the mobile station apparatus 200, information ofavailable downlink physical resource blocks (PRB) of the mobile stationapparatuses 200, the scheduling information input from the higher layer108 and others.

The scheduling information used for the uplink scheduling is output tothe data control section 101 and the data extracting section 107.

The scheduling section 104 maps the downlink logical channels input fromthe higher layer 108 to the transport channels before output to the datacontrol section 101. The scheduling section 104 processes the controldata acquired through the uplink and the transport channels input fromthe data extracting section 107 as needed and maps the control data andthe transport channels to the uplink logical channels and outputs themto the higher layer 108.

The channel estimating section 105 estimates an uplink channel statefrom an uplink demodulation reference signal (DRS) for the demodulationof uplink data and outputs the estimation result to the DFT-S-OFDMdemodulating section 106. The channel estimating section 105 alsoestimates an uplink channel state from an uplink sounding referencesignal (SRS) for scheduling the uplink and outputs the estimation resultto the scheduling section 104.

Although it is assumed that the communication method of the uplink isusing a single carrier method such as DFT-S-OFDM, a multicarrier methodsuch as OFDM method may also be used.

Based on the uplink channel state estimation result input from thechannel estimating section 105, the DFT-S-OFDM demodulating section 106executes DFT-S-OFDM signal processing such as DFT (Discrete FourierTransform) transform, sub-carrier mapping, IFFT transform, and filteringfor the modulated data input from the wireless section 103 to executethe demodulation processing before output to the data extracting section107.

The data extracting section 107 checks the correctness of the data inputfrom the DFT-S-OFDM demodulating section 106 based on the schedulinginformation from the scheduling section 104 and outputs the check result(acknowledgement signal ACK/negative acknowledgement signal NACK) to thescheduling section 104.

The data extracting section 107 divides the data input from theDFT-S-OFDM demodulating section 106 into the transport channels and thephysical layer control data based on the scheduling information from thescheduling section 104 and outputs them to the scheduling section 104.

The divided control data includes the feedback information (downlinkchannel feedback report (CQI, PMI, RI), ACK/NACK feedback informationfor downlink data) provided from the mobile station apparatus 200.

The higher layer 108 executes each processing for a packet dataconvergence protocol (PDCP) layer, a radio link control (RLC) layer, anda radio resource control (RRC) layer. Since the higher layer 108integrates to control the processing sections of the lower layers,interfaces exist between the higher layer 108 and the scheduling section104, the antenna section A1, the wireless section 103, the channelestimating section 105, the DFT-S-OFDM demodulating section 106, thedata control section 101, the OFDM modulating section 102, and the dataextracting section 107. However, the interfaces are not depicted.

The higher layer 108 includes a radio resource control section 109. Theradio resource control section 109 performs management of various partsof configuration information, management of system information,management of measurement configuration and measurement result, pagingcontrol, management of communication states of mobile stationapparatuses, management of migration such as handover, management ofbuffer status for each mobile station apparatus, management ofconnection setup of unicast and multicast bearers, management of mobilestation identifier (UEID) and others. The higher layer 108gives/receives information to/from another base station apparatus andinformation to/from a higher node.

FIG. 5 is a general block diagram of a configuration of the mobilestation apparatus 200 according to the first embodiment of the presentinvention. The mobile station apparatus 200 includes a data controlsection 201, a DFT-S-OFDM modulating section 202, a wireless section203, a scheduling section 204, a channel estimating section 205, an OFDMdemodulating section 206, a data extracting section 207, a higher layer208, and an antenna section A2.

A transmitting section comprises of the data control section 201, theDFT-S-OFDM modulating section 202, the wireless section 203, thescheduling section 204, the higher layer 208, and the antenna sectionA2. A receiving section comprises of the wireless section 203, thescheduling section 204, the channel estimating section 205, the OFDMdemodulating section 206, the data extracting section 207, the higherlayer 208, and the antenna section A2. A selecting section comprises ofthe scheduling section 204.

The antenna section A2, the data control section 201, the DFT-S-OFDMmodulating section 202, and the wireless section 203 execute processingfor the uplink physical layer. The antenna section A2, the wirelesssection 203, the channel estimating section 205, the OFDM demodulatingsection 206, and the data extracting section 207 execute processing forthe downlink physical layer. Some part of the respective transmittingsection and receiving section is configured to separately executeprocessing for each component carrier and some other part is configuredto execute common processing common to component carriers.

The data control section 201 acquires the transport channels from thescheduling section 204. The data control section 201 maps the transportchannels as well as signals and channels generated in the physical layerbased on the scheduling information input from the scheduling section204, to the physical channels based on the scheduling information inputfrom the scheduling section 204. The data mapped as described above areoutput to the DFT-S-OFDM modulating section 202.

The DFT-S-OFDM modulating section 202 executes DFT-S-OFDM signalprocessing such as data modulation, DFT processing, sub-carrier mapping,IFFT (Inverse Fast Fourier Transform) processing, insertion of cyclicprefix (CP), and filtering for the data input from the data controlsection 201 to generate and output a DFT-S-OFDM signal to the wirelesssection 203.

Although it is assumed that the communication method of the uplink isusing a single carrier method such as DFT-S-OFDM, a multicarrier methodsuch as OFDM method may also be used.

The wireless section 203 up-converts the modulated data input from theDFT-S-OFDM modulating section 202 to a radio frequency to generate andtransmit a radio signal to the base station apparatus 100 via theantenna section A2.

The wireless section 203 receives a radio signal modulated by thedownlink data from the base station apparatus 100 via the antennasection A2 and down-converts the modulated signal to a baseband signaland outputs the reception data to the channel estimating section 205 andthe OFDM demodulating section 206.

The scheduling section 204 executes processing for the medium accesscontrol layer. The scheduling section 104 performs the mapping of thelogical channels and the transport channels, the scheduling of thedownlink and the uplink (such as HARQ processing and selection oftransport format) and others. Since the scheduling section 204integrates to control the processing sections of the physical layers,interfaces exist between the scheduling section 204 and the antennasection A2, the data control section 201, the DFT-S-OFDM modulatingsection 202, the channel estimating section 205, the OFDM demodulatingsection 206, the data extracting section 207, and the wireless section203. However, the interfaces are not depicted.

In the scheduling of the downlink, the scheduling section 204 executesthe generation of the scheduling information used in the receptioncontrol of the transport channels and the physical signals and physicalchannels, the HARQ retransmission control, and the downlink scheduling,based on the scheduling information from the base station apparatus 100and the higher layer 208 (the transport format and the HARQretransmission information). The scheduling information used for thedownlink scheduling is output to the data control section 201 and thedata extracting section 207.

In the scheduling of the uplink, the scheduling section 204 executes thegeneration of the scheduling information used in the schedulingprocessing for mapping the uplink logical channels input from the higherlayer 208 to the transport channels and the uplink scheduling, based onthe uplink buffer status input from the higher layer 208, the uplinkscheduling information from the base station apparatus 100 input fromthe data extracting section 207 (the transport format and the HARQretransmission information), and the scheduling information input fromthe higher layer 208.

For the uplink transport format, the information provided from the basestation apparatus 100 is utilized. The scheduling information is outputto the data control section 201 and the data extracting section 207.

The scheduling section 204 maps the uplink logical channels input fromthe higher layer 208 to the transport channels and outputs them to thedata control section 201. The scheduling section 204 also outputs to thedata control section 201 the downlink channel feedback report (CQI, PMI,RI) input from the channel estimating section 205 and the CRCconfirmation result input from the data extracting section 207.

The scheduling section 204 processes the control data acquired throughthe downlink and the transport channels input from the data extractingsection 207 as needed and maps the control data and the transportchannels to the downlink logical channels and outputs them to the higherlayer 208.

The channel estimating section 205 estimates a downlink channel statefrom a downlink reference signal (RS) for the demodulation of downlinkdata and outputs the estimation result to the OFDM demodulating section206.

The channel estimating section 205 also estimates a downlink channelstate from the downlink reference signal (RS) for notifying the basestation apparatus 100 of the downlink channel state (wirelesspropagation channel state) and converts the estimation result into thedown link channel feedback report (such as channel quality information)to output to the scheduling section 204. The channel estimating section205 outputs the measurement result of the downlink reference signal (RS)to a radio resource control section 209 in order to notify the basestation apparatus 100 of the downlink measurement result.

The OFDM demodulating section 206 executes the OFDM demodulationprocessing for the modulated data input from the wireless section 203based on the downlink channel state estimation result input from thechannel estimating section 205 and outputs the data to the dataextracting section 207.

The data extracting section 207 performs the cyclic redundancy check(CRC) for the data input from the OFDM demodulating section 206 to checkthe correctness and outputs the check result (ACK/NACK feedbackinformation) to the scheduling section 204.

The data extracting section 207 divides the data input from the OFDMdemodulating section 206 into the transport channels and the physicallayer control data based on the scheduling information from thescheduling section 204 and output them to the scheduling section 204.The divided control data includes the scheduling information such asdownlink or uplink resource allocation and uplink HARQ controlinformation. In this case, a decoding processing is executed for thesearch space (also called search area) of the physical downlink controlsignal (PDCCH) to extract the downlink or uplink resource allocationintended for its own mobile station apparatus.

The higher layer 208 executes each processing for the packet dataconvergence protocol (PDCP) layer, the radio link control (RLC) layer,and the radio resource control (RRC) layer. The higher layer 208includes the radio resource control section 209. Since the higher layer208 integrates to control the processing sections of the lower layers,interfaces exist between the higher layer 208 and the scheduling section204, the antenna section A2, the data control section 201, theDFT-S-OFDM modulating section 202, the channel estimating section 205,the OFDM demodulating section 206, the data extracting section 207, andthe wireless section 203. However, the interfaces are not depicted.

The radio resource control section 209 performs management of variousparts of configuration information, management of system information,management of measurement configuration and measurement result, pagingcontrol, management of communication states of its own mobile stationapparatus, management of migration such as handover, management ofbuffer status, management of connection setup of unicast and multicastbearers, and management of mobile station identifier (UEID).

FIG. 3 is a diagram of an example of a network configuration of thepresent invention. In case the mobile station apparatus 200 is able toperform simultaneous communications using a plurality of frequencylayers (component carrier CC1 to component carrier CC3) by the carrieraggregation, it is conceivable that the mobile station apparatus 200uses a network configuration having one certain base station apparatus1002 including a transmitting section 21 and a transmitting section 22for a plurality of downlink frequency layers (CC2 and CC3) or having onebase station apparatus 1001 including one transmitting section 11 foreach frequency layer (CC1) and the both cases may be mixed; however,this embodiment can be implemented in any configuration without problem.The transmitting section 21 and the transmitting section 22 may compriseof one transmitting section. It is also conceivable in the uplink thatone base station apparatus includes a receiving section for each of aplurality of uplink frequency layers and that one base station apparatushas one receiving section for each frequency layer, and the both casesmay be mixed. The base station apparatuses 1001, 1002 may be managed bya higher control station 300 or the collaborative control may beachieved between the base station apparatus 1001 and the base stationapparatus 1002. The mobile station apparatus 200 recognizes componentcarriers as cells without paying any special attention to which basestation apparatus transmits a downlink component carrier and which basestation apparatus receives an uplink component carrier. The mobilestation apparatus 200 acquires the system information such as afrequency band and a bandwidth of a corresponding uplink componentcarrier from the system information broadcasted in each cell. Since theaddition of a component carrier (carrier aggregation) to the mobilestation apparatus 200 is performed by a dedicated signal (such as RRCsignaling), a component carrier specific to the mobile station apparatuscan be configured.

The mobile station apparatus manages a system information field that iscontent of the system information and a system information element (IE)comprises of one or more system information fields. These parts of thesystem information (including the system information fields and thesystem information elements) are managed by RRC of the mobile stationapparatus and the base station apparatus for each component carrier. Thesystem information is configuration information parameters managed bythe system that performs communications between the mobile stationapparatus and the base station apparatus and also the system informationis parameters necessary for the mobile station apparatus to operate inthe system. The system information includes a measurement configuration,a measurement identifier (measId), a measurement object, a reportingconfiguration and others.

The system information managed by RRC is broadcasted through thebroadcast control channel (BCCH) or provided from the base stationapparatus to the mobile station apparatus through the RRC signaling bythe common control channel (CCCH) and/or the dedicated control channel(DCCH).

The system information managed by RRC is managed as a differentparameter for each component carrier (specific to each componentcarrier).

When the system information is provided by the RRC signaling, a new RRCmessage type may be prepared for each part of the system information insuch a way that the system information is provided by specifying anidentification number of a component carrier, or an RRC connectionreconfiguration (RRCConnectionReconfiguration) message may be extendedsuch that the RRC connection reconfiguration(RRCConnectionReconfiguration) message can be provided by specifying anidentification number of a component carrier. A physical cell identifier(physicalCellIdentity) and a corresponding frequency may be reused foran identification number of a component carrier.

When the broadcast control channel (BCCH) is used for providing thesystem information by SIB (SystemInformationBlock) (aggregation of aplurality of parts of information transmitted in the same transmissioncycle), the system information is provided by specifying anidentification number of a component carrier to which the systeminformation is applied. Alternatively, a component carrier located withSIB which provides the system information may be defined as thecomponent carrier to which the system information is applied.

The mobile station apparatus manages the system information of one ormore component carriers with a bandwidth of a section of the system bandand, when a component carrier is added to the mobile station apparatus,the mobile station apparatus applies the system information of thecurrently accessing component carrier to the added component carrier.For the system information not provided as the system informationapplied to the added component carrier when the component carrier isadded to the mobile station apparatus, the mobile station apparatusapplies the system information of the currently accessing componentcarrier to the added component carrier. For predetermined certain systeminformation, the mobile station apparatus applies the system informationof the currently accessing component carrier to the added componentcarrier when the component carrier is added to the mobile stationapparatus. For predetermined certain system information, the mobilestation apparatus applies the system information having a default value(initial value) to the added component carrier when component carrier isadded to the mobile station apparatus.

The addition of a component carrier (carrier aggregation) canconceptually be considered as addition of an active component carrier(cell) or activation of a component carrier (cell). The active componentcarriers (cells) are referred to as active set cells or active setcomponent carriers. The active set cells include cells (or componentcarriers) of the same and different frequency layers.

When acquiring the information related to the addition of a componentcarrier, the mobile station apparatus 200 adjusts the wireless section203 so as to receive the added component carrier.

A method of measurement of the mobile station apparatus will then bedescribed in the case of communication using a plurality of cells(component carriers).

<First Interpretation of Serving Cell>

An example of concept of the serving cell (first interpretation of theserving cell) will be described with reference to FIG. 6. The mobilestation apparatus and the base station apparatus consider each of activecomponent carriers as a serving cell (serving cells). Neighboring cellsare cells other than the serving cell when one cell of the active setcells is considered as the serving cell. Therefore, a cell in an activeset may be considered as a neighboring cell depending on which cell isconsidered as a serving cell. This leads to an extension of the conceptof the serving cell and, therefore, the configuration related to themeasurements of a plurality of frequency layers can efficiently beperformed. The measurements between cells within an active set can beconsidered as measurements of a serving cell and a neighboring cell atthe time of the measurements. The configurations of the serving cell andthe neighboring cell which are configured in each cell can directly beapplied.

<Second Interpretation of Serving Cell>

Another example of concept of the serving cell (second interpretation ofthe serving cell) will be described with reference to FIG. 7. The mobilestation apparatus and the base station apparatus consider all the activecomponent carriers as serving cells. The neighboring cells are cellsthat are not configured in the active set cells. This leads to anextension of the concept of the serving cell and, therefore, theconfiguration related to measurements of a plurality of frequency layerscan efficiently be performed. The cells within the active set cells canbe omitted from the neighboring cells to be measured at the time of themeasurements. The configurations of the serving cell and the neighboringcell that are configured in each cell can directly be applied.

<Interpretation of Inter-Frequency Measurements>

The definition of the intra-frequency measurements and theinter-frequency measurements when the active set cells are configuredare described with reference to FIG. 8. The intra-frequency measurementsmean measurements at each downlink frequency of cells that areconfigured in the active set cells. The inter-frequency measurementsmean measurements at a frequency different from each downlink frequencyof cells that are configured in the active set cells. Therefore,assuming that a cell measured as a serving cell is a cell within theactive set cells, the measurements between the serving cell to bemeasured within the active set cells and a cell having a differentfrequency within the active set cells is the inter-frequencymeasurements. This enables the base station apparatus and the mobilestation apparatus to automatically manage the inter-frequencymeasurements and the intra-frequency measurements depending on theconfiguration of the active set cells.

<Measurement Objects>

The measurement objects are defined for each frequency and do not needto be configured for each cell in the active set cells. In this case, acommon value can be used as the measurement identifier (measObjectId)for each cell (component carrier) without discrimination. Thisconfiguration is applicable to both the first interpretation of theserving cell and the second interpretation of the serving cell.

However, an identification number of a component carrier (cellidentification number within the active set cells) may be specified toconfigure a measurement object for each cell (component carrier). Inthis case, the measurement object identifier is differentiated for eachcell (component carrier). The mobile station apparatus and the basestation apparatus specify a measurement object identifier (measObjectId)including a component carrier identification number as an informationelement or a component carrier identification number and a measurementobject identifier (measObjectId) to identify a measurement object. Thisconfiguration is applicable to both the first interpretation of theserving cell and the second interpretation of the serving cell. If anidentification number of a component carrier is specified, the servingcell for the measurement object (measurement reference cell (object cellof a measurement result Ms)) is the specified cell (component carrier).

<Reporting Configuration>

If the measurement reference cell (object cell of the measurement resultMs) is already prescribed, the reporting configuration does not need tobe configured for each cell of the active set cells. In this case, acommon value can be used as the reporting configuration identifier(reportConfigId) without differentiation between component carriers.This configuration is applicable to both the first interpretation of theserving cell and the second interpretation of the serving cell.

The reporting configuration may be implemented such that the reportingconfiguration is configured for each component carrier considered as themeasurement reference cell (object cell of the measurement result Ms) byspecifying an identification number of a component carrier (cellidentification number within the active set cells) since a plurality ofthe serving cells exist as the measurement objects.

The mobile station apparatus and the base station apparatus specify areporting configuration identifier (reportConfigId) including acomponent carrier identification number as an information element or acomponent carrier identification number and a reporting configurationidentifier (reportConfigId) to identify a reporting configuration. Themobile station apparatus and the base station apparatus define thespecified cell (component carrier) as the measurement reference cell(object cell of the measurement result Ms) when considering thereporting configuration. This configuration is applicable to both thefirst interpretation of the serving cell and the second interpretationof the serving cell.

<Measurement Identifier>

A common value can be used as the measurement identifier (measId) foreach component carrier without discrimination. This configuration isapplicable to both the first interpretation of the serving cell and thesecond interpretation of the serving cell.

The measurement identifier (measId) may be implemented such that themeasurement identifier (measId) is configured for each component carrierconsidered as the measurement reference cell (object cell of themeasurement result Ms) by specifying an identification number of acomponent carrier (cell identification number within the active setcells) since a plurality of the serving cells exist as the measurementobjects.

The mobile station apparatus and the base station apparatus specify ameasurement identifier (measId) including a component carrieridentification number as an information element or a component carrieridentification number and a measurement identifier (measId) to link themeasurement object and the reporting configuration. The mobile stationapparatus and the base station apparatus define the specified componentcarrier as the measurement reference cell (object cell of themeasurement result Ms) when considering the measurement. Thisconfiguration is applicable to both the first interpretation of theserving cell and the second interpretation of the serving cell.

<First Interpretation of Measurement Reference Cell (Object Cell ofMeasurement Result Ms)>

As depicted in FIG. 9, the measurement reference cell (object cell ofthe measurement result Ms) is a cell (component carrier) that is areference of a measurement object when the measurement is performed.Namely, a measurement reference cell is a serving cell in a measurementobject. As described above, the measurement reference cell (object cellof the measurement result Ms) is identified by the identification number(sell identification number within the active set cells) of thecomponent carrier specified by the measurement identifier (measId), themeasurement object, and the reporting configuration in one method.

In other words, the measurement reference cell (object cell of themeasurement result Ms) may be specified by any one of the configurationof the measurement identifier (measId), the configuration of themeasurement objects, and the reporting configuration. The physical cellidentifier (physicalCellIdentity) and the target frequency may bediverted to the identification number of the component carrier. Thismethod (the first interpretation of the measurement reference cell)prescribes or links the measurement reference cell (object cell of themeasurement result Ms) for each measurement identifier (measId). Whenthe measurement reference cell (object cell of the measurement resultMs) is prescribed for each measurement identifier (measId), the basestation apparatus can configure the measurement for each componentcarrier.

<Second Interpretation of Measurement Reference Cell (Object Cell ofMeasurement Result Ms)>

As depicted in FIG. 10, the measurement reference cell (object cell ofthe measurement result Ms) is a cell (component carrier) that is areference of a measurement object when the measurement is performed.Namely, a measurement reference cell is a serving cell in a measurementobject. In another method (the second interpretation of the measurementreference cell), all or a plurality of the serving cells described inthe second interpretation of the serving cell are defined as themeasurement reference cells (object cells of the measurement result Ms)(all or a plurality of the cells are defined as the measurementreference cells (object cells of the measurement result Ms)). In otherwords, this ways that a plurality of the measurement reference cells(object cells of the measurement result Ms) are provided. In this case,the mobile station apparatus reports the report results for a pluralityof measurement reference cells (object cells of the measurement resultMs). If a plurality of measurement reference cells are configuredindependently of the active set cells, a plurality of the measurementreference cells (object cells of the measurement result Ms) arespecified by any one of the configuration of the measurement identifier(measId), the configuration of the measurement objects, and thereporting configurations. If a plurality of measurement reference cellsare defined as all the cells of the active set cells, the measurementreference cells (object cells of the measurement result Ms) aredetermined depending on the configuration of the active set cells.

<Serving Cell Quality Threshold (s-Measure)>

If the base station apparatus provides the serving cell qualitythreshold (s-Measure), the mobile station apparatus performs themeasurement of neighboring cells and the event evaluation (whether theevent triggering criteria are satisfied; also referred to as theevaluation of reporting criteria) when the quality (RSRP value) of themeasurement reference cell (object cell of the measurement result Ms) islower than the serving cell quality threshold (s-Measure). On the otherhand, if the base station apparatus does not provide the serving cellquality threshold (s-Measure), the mobile station apparatus performs themeasurement of neighboring cells and the event evaluation regardless ofthe quality (RSRP value) of the measurement reference cell (object cellof the measurement result Ms).

<First Interpretation of Event Triggering Criteria>

Event triggering criteria for performing a measurement report (firstinterpretation of the event triggering criteria) will be described withreference to FIG. 11.

The symbol Ms denotes a measurement result for a cell (componentcarrier) specified as the measurement reference cell. The symbol Mndenotes a measurement result for a cell (component carrier) notspecified as the measurement reference cell in the measurement object.

The symbol Ofn denotes a frequency-specific measurement offset value fora frequency of a cell (component carrier) not specified as themeasurement reference cell. In the case of the intra-frequencymeasurements, Ofn is the same as Ofs. In the case of the inter-frequencymeasurements, Ofn is a frequency offset (offsetFreq) included in themeasurement object EUTRA (measObjectEUTRA) corresponding to a downlinkfrequency different from the measurement reference cell.

The symbol Ocn is a cell-specific measurement offset value for afrequency of a cell (component carrier) not specified as the measurementreference cell. In the case of the intra-frequency measurements, Ocn isa cell individual offset (cellIndividualOffset) included in themeasurement object EUTRA (measObjectEUTRA) of the downlink frequencysame as the measurement reference cell. In the case of theinter-frequency measurements, Ocn is a cell individual offset(cellIndividualOffset) included in the measurement object EUTRA(measObjectEUTRA) corresponding to a downlink frequency different fromthe measurement reference cell.

The symbol Ofs is a frequency-specific offset value for a frequency ofthe measurement reference cell.

The symbol Ocs is a cell-specific measurement offset value for themeasurement reference cell.

The mobile station generates the events in accordance with themeasurement result Ms of the measurement reference cell (events A1, A2),or the measurement result Ms of the measurement reference cell and themeasurement result Mn of a cell (component carrier) not specified as themeasurement reference cell (events A3, A5), or the measurement result Mnof a cell (component carrier) not specified as the measurement referencecell (event A4). It is desirable that this implementation 1 of the eventtriggering criteria is applied to the first interpretation of theserving cell and the first interpretation of the measurement referencecell. By setting the measurement parameters for each measurementreference cell in this way, the base station apparatus can manipulatethe priority of reporting among the component carriers.

<Second Interpretation of Event Triggering Criteria>

Other event triggering criteria for performing a measurement report(second interpretation of the event triggering criteria) will bedescribed with reference to FIG. 12.

The symbol Ms denotes a measurement result for a cell (componentcarrier) specified as the measurement reference cell. The symbol Mndenotes a measurement result for a cell (component carrier) not includedin the active set cells in the measurement object.

Other parameters are the same as in the first interpretation of theevent triggering criteria.

The mobile station generates the events in accordance with themeasurement result Ms of the measurement reference cell (events A1, A2),or the measurement result Ms of the measurement reference cell and themeasurement result Mn of a cell (component carrier) not included in theactive set cells (events A3, A5), or the measurement result Mn of a cell(component carrier) not included in the active set cells (event A4). Inthis case, an event between cells in the active set cells is nottriggered. It is desirable that the second interpretation of the eventtriggering criteria is applied to the second interpretation of theserving cell and the first interpretation of the measurement referencecell. By setting the measurement parameters for each measurementreference cell in this way, the base station apparatus can manipulatethe priority of reporting among the component carriers.

<Third Interpretation of Event Triggering Criteria>

Other event triggering criteria for performing a measurement report(third interpretation of the event triggering criteria) will bedescribed with reference to FIG. 13.

The symbol Ms denotes a measurement result for each of a plurality ofthe measurement reference cells (component carriers) as described in thesecond interpretation of the measurement reference cell. The symbol Mndenotes a measurement result for a cell (component carrier) other thanthe measurement reference cell at the time of measurement of each of themeasurement reference cells (object cells of the measurement result Ms)in the measurement object.

The symbol Ofn denotes a frequency-specific measurement offset value fora frequency of the object cell of Mn. In the case of the intra-frequencymeasurements, Ofn is the same as Ofs. In the case of the inter-frequencymeasurements, Ofn is an offset frequency (offsetFreq) included in themeasurement object EUTRA (measObjectEUTRA) corresponding to a downlinkfrequency different from each of the measurement reference cells.

The symbol Ocn is a cell-specific measurement offset value for afrequency of the object cell of Mn. In the case of the intra-frequencymeasurements, Ocn is a cell individual offset (cellIndividualOffset)included in the measurement object EUTRA (measObjectEUTRA) of thedownlink frequency same as each of the measurement reference cells. Inthe case of the inter-frequency measurements, Ocn is a cell individualoffset (cellIndividualOffset) included in the measurement object EUTRA(measObjectEUTRA) corresponding to a downlink frequency different fromeach of the measurement reference cells.

The symbol Ofs is a frequency-specific offset value for a frequency ofeach of the measurement reference cells.

The symbol Ocs is a cell-specific measurement offset value for each ofthe measurement reference cells.

The mobile station generates the events in accordance with themeasurement result Ms of each of the measurement reference cells (eventsA1, A2), or the measurement result Ms of each of the measurementreference cells and the measurement result Mn of a cell (componentcarrier) other than the measurement reference cell at the time ofmeasurement of each of the measurement reference cells (object cells ofthe measurement result Ms) (events A3, A5), or the measurement result Mnof a cell (component carrier) other than the measurement reference cellat the time of measurement of each of the measurement reference cells(object cells of the measurement result Ms) (event A4). It is desirablethat this implementation 3 of the event triggering criteria is appliedto the first interpretation of the serving cell and the secondinterpretation of the measurement reference cell. By setting themeasurement parameters for each measurement reference cell in this way,the base station apparatus can manipulate the priority of reportingamong the component carriers.

<Fourth Interpretation of Event Triggering Criteria>

Other event triggering criteria for performing a measurement report(fourth interpretation of the event triggering criteria) will bedescribed with reference to FIG. 14.

The symbol Ms denotes a measurement result for each of all or aplurality of the measurement reference cells (component carriers) in theactive set as described in the second interpretation of the measurementreference cell. The symbol Mn denotes a measurement result for a cell(component carrier) other than the cell configured as the measurementreference cell (object cell of the measurement result Ms) in themeasurement object.

Other parameters are the same as in the third interpretation of theevent triggering criteria.

The mobile station generates the events in accordance with themeasurement result Ms of the measurement reference cell (events A1, A2),or the measurement result Ms of the measurement reference cell and themeasurement result Mn of a cell (component carrier) not specified as themeasurement reference cell (events A3, A5), or the measurement result Mnof a cell (component carrier) not specified as the measurement referencecell (event A4). In this case, an event between cells configured as themeasurement reference cells (object cells of the measurement result Ms)is not triggered. It is desirable that this implementation 3 of theevent triggering criteria is applied to the second interpretation of theserving cell and the second interpretation of the measurement referencecell. By setting the measurement parameters for each measurementreference cell in this way, the base station apparatus can manipulatethe priority of reporting among the component carriers.

<Regarding Measurement Result>

If the measurement reference cell is specified for each measurementidentifier (measId), the measurement result is the same as that when theactive set cells are not configured (when the carrier aggregation is notperformed) and it is desirable that the serving cell measurement result(measResultServing) is reported as the results of the reference signalreceived power (RSRP) and the reference signal received quality (RSRQ)of the cell configured as the measurement reference cell. In this case,the base station plays a leading role in specifying/determining themeasurement reference cell. If the measurement reference cell isidentifiable by a measurement identifier (measId) and an identificationnumber of a component carrier (cell identification number in the activeset cells), the identification number of the component carrier (cellidentification number in the active set cells) is also specified. Thatis, the mobile station apparatus performs the measurement for aplurality of measurement reference cells and reports the measurementreference cell satisfying the triggering criteria. In this case, themobile station apparatus takes the lead in specifying/determining themeasurement reference cell. Although the physical cell identifier(physicalCellIdentity) utilized for identifying a cell may be the samebetween component carriers, the physical cell identifier is identifiableby a frequency since the measurement object EUTRA (measObjectEUTRA) isconfigured for each frequency.

If a plurality of measurement reference cells are specified to themeasurement identifier, the measurement result is reported in thefollowing method (first method of the measurement result).

The measurement result is reported as the results of the referencesignal received power (RSRP) and the reference signal received quality(RSRQ) of all the cells configured as the measurement reference cells(or all the cells in the active set cells). That is, the measurementreport includes the results of the reference signal received power(RSRP) and the reference signal received quality (RSRQ) of all the cellsconfigured as the measurement reference cells (or all the cells in theactive set cells) regardless of type of event. This enables the basestation apparatus to comprehend the statuses of all cells configured asthe measurement reference cells by the mobile station apparatus (or allthe cells in the active set cells) without particular specification andto estimate a cause of each event.

In another method, (second method of the measurement result), if aplurality of measurement reference cells are specified to themeasurement identifier, the measurement result is reported as follows.

The mobile station apparatus determines an optimum cell from the resultsof the reference signal received power (RSRP) and/or the referencesignal received quality (RSRQ) of all the cells configured as themeasurement reference cells (or all the cells in the active set cells).The report is made by including the component carrier identificationnumber (cell identification number in the active set cells) of theoptimum cell and the reference signal received power (RSRP) and/or thereference signal received quality (RSRQ) of the optimum cell in theserving cell measurement result. The event to be reported is only theevent with the optimum cell defined as the measurement reference cell.For the measurement of the optimum cell, values may be compared afteradding Ofs of the frequencies and Ocs of the measurement reference cellsto the measurement reference cells. This enables the base stationapparatus to manipulate the priority of reporting among the componentcarriers.

The measurement repot for the optimum cell among all the cellsconfigured as the measurement reference cells (or all the cells in theactive set cells) may be considered as another event and assigned withan event identifier (eventId). In other words, a report is triggeredwhen the optimum cell (component carrier) is changed in consideration ofOfs of the frequencies and Ocs of the measurement reference cells forthe measurement reference cells.

<Addition/Modification/Deletion of Active Set Cell>

A processing method of the system information related to the measurementwhen an active set cell (component carrier) is added/modified with thedescribed.

When a notification of addition/modification of an active set cell(component carrier) is given, the measurement reference cells (objectcells of the measurement result Ms) are determined in accordance withthe configuration of the active set cells if a plurality of themeasurement reference cells are defined as all the cells of the activeset cells in the second interpretation of the measurement referencecells.

A processing method of the system information related to the measurementwhen an active set cell (component carrier) is deleted will be describedwith reference to FIG. 15.

If an active set cell is deleted, all the measurement identifiers(measId) linked to the measurement object identifier (measObjectId)corresponding to the carrier frequency of the deleted cell are deleted.

If the active set cell is deleted, all the measurement identifiers(measId) linked to the measurement reference cell corresponding to thecarrier frequency of the deleted cell are deleted.

A processing method of the system information related to the measurementwhen active set cells (component carriers) are added and deleted will bedescribed.

If active set cells are concurrently added and deleted (replacement ofactive set cells), the measurement identifier (measId) linked to themeasurement object identifier (measObjectId) corresponding to thecarrier frequency of the added cell is linked to the measurementidentifier (measId) linked to the measurement object identifier(measObjectId) corresponding to the carrier frequency of the deletedcell, and the measurement identifier (measId) linked to the measurementobject identifier (measObjectId) corresponding to the carrier frequencyof the deleted cell is linked to the measurement identifier (measId)linked to the measurement object identifier (measObjectId) correspondingto the carrier frequency of the added cell.

By automatically changing the measurement configuration in accordancewith the processing such as addition/deletion/modification/replacementof an active set cell, signals for the configuration can be reduced andthe configuration can quickly be applied.

A wireless communication system according to a second embodiment of thepresent invention will be described. Only the sections of the secondembodiment different from the first embodiment will hereinafter bedescribed.

A DL master frequency (also referred to as downlink primary componentcarrier or downlink primary cell) may be a downlink frequency layer (acomponent carrier or a component carrier group) that the mobile stationapparatus initially accesses or monitors, or a certain downlinkfrequency layer determined in accordance with specification from thebase station apparatus. At least a downlink synchronization signal (SCH)is located for acquiring the downlink synchronization.

A DL slave frequency (also referred to as downlink secondary componentcarrier or downlink secondary cell) is a downlink frequency layer notspecified as the DL master frequency among accessible component carriersspecified by the base station apparatus.

A UL master frequency (also referred to as uplink primary componentcarrier) may be an uplink frequency layer (a component carrier or acomponent carrier group) that the mobile station apparatus initiallyaccess, or component carrier or a component carrier group specified bythe DL master frequency or corresponding to the DL master frequency, ora certain uplink frequency layer determined in accordance withspecification from the base station apparatus.

A UL slave frequency (also referred to as uplink secondary componentcarrier) is an uplink frequency layer not specified as the UL masterfrequency among accessible component carriers specified by the basestation apparatus.

Hereinafter, a master frequency or a slave frequency in the followingdescription means the DL master frequency and/or the UL masterfrequency, or the DL slave frequency and/or the UL slave frequency.

Master frequencies and slave frequencies of mobile station apparatusesmay be different. In other words, a master frequency for one mobilestation apparatus may be configured as a slave frequency for anothermobile station apparatus. This represents that a component carrierspecific to a mobile station apparatus can be configured since acomponent carrier is added to a mobile station apparatus through adedicated signal.

A master frequency and a slave frequency may be arranged in adjacentcarrier frequencies or distant carrier frequencies.

A master frequency may be defined for each function. A master frequencyrelated to the measurement will be described in this description.

The mobile station apparatus manages system information field that is acontent of the system information and a system information element (IE)comprises of one or more system information fields. These parts of thesystem information (including the system information fields and thesystem information elements) are managed by RRC of the mobile stationapparatus and the base station apparatus for each component carrier. Thesystem information acts as configuration information parameters managedby the system that performs communications using the mobile stationapparatus and the base station apparatus and also acts as parametersnecessary for the mobile station apparatus to operate in the system. Thesystem information includes a measurement configuration, a measurementidentifier (measId), a measurement object, a reporting configuration andothers.

The system information managed by RRC is broadcasted through thebroadcast control channel (BCCH) or provided from the base stationapparatus to the mobile station apparatus through the RRC signaling ofthe common control channel (CCCH) and/or the dedicated control channel(DCCH).

When the master frequency is specified, the mobile station apparatus andthe base station apparatus apply and manage the system information usedat the master frequency to the component carriers.

A method of measurement of the mobile station apparatus will then bedescribed in the case of communication using a plurality of componentcarriers.

<Interpretation of Serving Cell>

One example of concept of the serving cell will be described withreference to FIG. 16. The mobile station apparatus and the base stationapparatus consider the DL master frequency as the serving cell.Neighboring cells are cells other than the DL master frequency. When onecell in the active set cells is considered as the serving cell,neighboring cells are cells other than the serving cell. Therefore, acell in an active set can be considered as a neighboring cell dependingon which cell is considered as the serving cell. This leads to anextension of the concept of the serving cell and, therefore, theconfiguration related to a measurement of a plurality of frequencylayers can efficiently be performed. The measurement can be performedwith reference to one cell.

Another example of concept of the serving cell will be described withreference to FIG. 17. The mobile station apparatus and the base stationapparatus consider the DL master frequency in the serving cells as themeasurement reference cell. The serving cells comprise of a plurality ofcomponent carriers including the DL master frequency. The neighboringcells are cells other than the serving cells comprise of a plurality ofcomponent carriers including the DL master frequency. This leads to anextension of the concept of serving cell and, therefore, theconfiguration related to a measurement of a plurality of frequencylayers can efficiently be performed. The measurement can be performedwith reference to one component carrier in cells.

<Interpretation of Inter-Frequency Measurement>

The definition of the intra-frequency measurement and theinter-frequency measurement when the active set cells are configuredwill be described with reference to FIG. 18. The intra-frequencymeasurement is a measurement at the downlink frequency of the DL masterfrequency. The inter-frequency measurement is a measurement at afrequency different from the downlink frequency of the DL masterfrequency.

<Measurement Object>

A common value can be used as the measurement identifier (measObjectId)for each component carrier without discrimination.

<Reporting Configuration>

A common value can be used as the reporting configuration identifier(reportConfigId) for each component carrier without discrimination.

<Measurement Identifier>

A common value can be used as the measurement identifier (measId) foreach component carrier without discrimination.

<Interpretation of Event Triggering Criteria>

Event triggering criteria for performing a measurement report will bedescribed with reference to FIG. 19.

The symbol Ms denotes a measurement result for the DL master frequency.The symbol Mn denotes a measurement result for a cell (componentcarrier) not specified as the DL master frequency.

The symbol Ofn denotes a frequency-specific measurement offset value fora frequency of a cell (component carrier) not specified as the DL masterfrequency. In the case of the intra-frequency measurements, Ofn is thesame as Ofs. In the case of the inter-frequency measurements, Ofn is anoffset frequency (offsetFreq) included in the measurement object EUTRA(measObjectEUTRA) corresponding to a downlink frequency different fromthe DL master frequency.

The symbol Ocn is a cell-specific measurement offset value for afrequency of a cell (component carrier) not specified as the DL masterfrequency. In the case of the intra-frequency measurements, Ocn is acell individual offset (cellIndividualOffset) included in themeasurement object EUTRA (measObjectEUTRA) of the downlink frequencysame as the DL master frequency. In the case of the inter-frequencymeasurements, Ocn is a cell individual offset (cellIndividualOffset)included in the measurement object EUTRA (measObjectEUTRA) correspondingto a downlink frequency different from the DL master frequency.

The symbol Ofs is a frequency-specific offset value for a frequency ofthe DL master frequency.

The symbol Ocs is a cell-specific measurement offset value for the DLmaster frequency.

The mobile station apparatus generates events in accordance with themeasurement result Ms of the DL master frequency and the measurementresult Mn of a cell (component carrier) not specified as the DL masterfrequency. The control can be facilitated by unifying the measurementparameter configuration with the DL master frequency in this way.

<Regarding Measurement Result>

The serving cell measurement result (measResultServing) is reported asthe results of the reference signal received power (RSRP) and thereference signal received quality (RSRQ) of the cell configured as theDL master frequency.

<Change of DL Master Frequency>

In case the DL master frequency is changed, the measurement identifier(measId) linked to the measurement object identifier (measObjectId)corresponding to the carrier frequency of the DL master frequency afterthe change is linked to the measurement identifier (measId) linked tothe measurement object identifier (measObjectId) corresponding to thecarrier frequency of the DL master frequency before the change, and themeasurement identifier (measId) linked to the measurement objectidentifier (measObjectId) corresponding to the carrier frequency of theDL master frequency before the change is linked to the measurementidentifier (measId) linked to the measurement object identifier(measObjectId) corresponding to the carrier frequency of the DL masterfrequency after the change. By automatically changing the measurementconfiguration in accordance with processing such as a change in the DLmaster frequency, signals for the configuration can be reduced and theconfiguration can quickly be applied.

In each of the embodiments, a component carrier can simply be construedas a cell and a mobile station apparatus can be construed as managingsystem information of a plurality of cells. In this case, it isconstrued that an active (activated) cell is added or a cell isactivated in the RRC signaling instead of addition of a componentcarrier. Communication through a plurality of component carriers isconstrued as communication through a plurality of active cells. It canalso be construed that a plurality of component carriers is managed inone cell.

Although one system comprises of a plurality of component carriers inthe description of each of the embodiments, it can be construed that aplurality of systems are aggregated and configured as one system. Acomponent carrier can also be construed as indicating an area where asystem is operated by matching a carrier frequency with the center ofeach component carrier on the certain reception side or the certaintransmission side.

The embodiments may be implemented in a combined manner.

In each of the embodiments, pluralities of base station apparatuses andmobile station apparatuses may exist. A mobile station is not limited toa moving terminal and may be realized by implementing the function ofthe mobile station apparatus in a base station apparatus or a fixedterminal.

In each of the embodiments described above, a program for implementingthe functions in the base station apparatus or the functions in themobile station apparatus may be recorded in a computer readablerecording medium and the program recorded in this recording medium maybe read and executed by a computer system to control the base stationapparatus or the mobile station apparatus. A “computer system” as usedherein is assumed to include OS and hardware such as peripherals.

A “computer readable recording medium” means a portable medium such as aflexible disk, a magnetic optical disk, ROM, or CD-ROM, and a storagedevice such as a hard disk built into a computer system. A “computerreadable recording medium” is assumed to include those dynamicallyretaining a program for a short time like a network such as the internetand communication wires when a program is transmitted through acommunication line such as a telephone line, and those retaining aprogram for a certain time like a volatile memory within a computersystem acting as a server or a client in such a case. The program may befor the purpose of implementing a section of the functions and may be aprogram capable of implementing the functions in combination with aprogram already recorded in a computer system.

Although the embodiments of the present invention have been described indetail with reference to the drawings, specific configurations are notlimited to the embodiments and the claims include designs and others,within a range not departing from the spirit of the present invention.

EXPLANATIONS OF REFERENCE NUMERALS

100 . . . base station apparatus; 101 . . . data control section; 102 .. . OFDM modulating section; 103 . . . wireless section; 104 . . .scheduling section; 105 . . . channel estimating section; 106 . . .DFT-S-OFDM demodulating section; 107 . . . data extracting section; 108. . . higher layer; 200 . . . mobile station apparatus; 201 . . . datacontrol section; 202 . . . DFT-S-OFDM modulating section; 203 . . .wireless section; 204 . . . scheduling section; 205 . . . channelestimating section; 206 . . . OFDM demodulating section; 207 . . . dataextracting section; 208 . . . higher layer; A1, A2 . . . antennasection; 1001 . . . base station apparatus; 1002 . . . base stationapparatus; 11 . . . transmitting section; 21 . . . transmitting section;22 . . . transmitting section; 300 . . . control station.

1. A mobile station apparatus which is configured to communicate with abase station apparatus by carrier aggregation using a plurality ofcells, wherein each cell of the plurality of cells has a differentfrequency, the mobile station apparatus comprising: a wireless sectionconfigured to receive, from the base station apparatus, a configurationmessage including a measurement configuration, wherein the measurementconfiguration includes a measurement object and a reportingconfiguration; and a radio resource control section is configured to:determine a first cell from among the plurality of cells based on themeasurement object included in the measurement configuration receivedfrom the base station apparatus, perform a measurement of the firstcell, and evaluate an event using a measurement result of the firstcell, wherein the measurement object is linked to the reportingconfiguration and indicates the measurement frequency, the reportingconfiguration includes an criterion, and the criterion triggers themobile station apparatus to send a measurement report.
 2. The mobilestation apparatus according to claim 1, wherein the wireless section isfurther configured to transmit, to the base station apparatus, themeasurement report including the measurement result of the first cell ina case that the criterion is satisfied.
 3. The mobile station apparatusaccording to claim 1, wherein the event is evaluated by using a specificoffset value for the first cell.
 4. The mobile station apparatusaccording to claim 3, wherein the event is evaluated by using a specificoffset value for a cell that is not determined as the first cell.
 5. Themobile station apparatus according to claim 1, wherein the first cell isdetermined from among the plurality of the cells based on the frequencyto be measured.
 6. Abase station apparatus which is configured tocommunicate with a mobile station apparatus by carrier aggregation usinga plurality of cells, wherein each cell of the plurality of cells has adifferent frequency, the base station apparatus comprising: a wirelesssection configured to transmit, to the mobile station apparatus, aconfiguration message including a measurement configuration, wherein themeasurement configuration includes a measurement object and a reportingconfiguration, the measurement object is used by the mobile stationapparatus to determine a first cell from among the plurality of cells,the measurement object is linked to the reporting configuration andindicates the measurement frequency, the reporting configurationincludes an criterion, and the criterion triggers the mobile stationapparatus to send a measurement report.
 7. A method performed by amobile station apparatus which is configured to communicate with a basestation apparatus by carrier aggregation using a plurality of cells,wherein each cell of the plurality of cells has a different frequency,the method comprising: receiving, from the base station apparatus, aconfiguration message including a measurement configuration, wherein themeasurement configuration includes a measurement object and a reportingconfiguration; determining a first cell from among the plurality ofcells based on the measurement object included in the measurementconfiguration received from the base station apparatus; performing ameasurement of the first cell; and evaluating an event using ameasurement result of the first cell, wherein the measurement object islinked to the reporting configuration, and indicates the measurementfrequency, the reporting configuration includes an criterion, and thecriterion triggers the mobile station apparatus to send a measurementreport.
 8. A method performed by a base station apparatus which isconfigured to communicate with a mobile station apparatus by carrieraggregation using a plurality of cells, wherein each cell of theplurality of cells has a different frequency, the method comprising:transmitting, to the mobile station apparatus, a configuration messageincluding a measurement configuration, wherein the measurementconfiguration includes a measurement object and a reportingconfiguration, the measurement object is used by the mobile stationapparatus to determine a first cell from among the plurality of cells,the measurement object is linked to the reporting configuration andindicates the measurement frequency, the reporting configurationincludes an criterion, and the criterion triggers the mobile stationapparatus to send a measurement report.